Materials Literature
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Ferritic spheroidal graphite cast irons generally exhibit intergranular fracturing even if the specimens are strengthened by silicon in solid solution when tested under wet conditions. The maximum area fraction of intergranular fracture is closely related to the microstructural feature and ambient aqueous environment…
The American Mineralogist Crystal Structure Database is a compilation of every crystal structure potentially of mineralogic or geologic interest. The database, seen as an outreach service, is funded and maintained by NSF, the Mineralogical Society of America and the Mineralogical Association of Canada. This database,…
The influence of stress and fatigue under various stress amplitudes on the magnetic properties of a range of magnetic alloys (Ni, Fe55Ni45, Fe64Ni36 and Fe54Ni29Co17) was studied. Barkhausen effect signal and symmetrical minor hysteresis loops were measured at various stages during the tensile and fatigue tests. The d…
A unified theory of the liquid‐glass transition based on the two band model in the harmonic potential approximation is presented. The Kauzmann paradox on the Kauzmann entropy crisis and the Vogel‐Tamman‐Fulcher (VTF) law on the relaxation times and the transport coefficients are elucidated. The hopping of the particle…
This paper discusses the systems for microcellular injection moulding developed and patented by Trexel and IKV. It then introduces a third design with initial findings and recommendations for modifications. The results suggest that microcellular foaming is possible introducing supercritical carbon dioxide in the nozzl…
The increasingly high capital investment required for large autoclaves, ovens and facilities for the processmg of large composite components creates a number of financial constraints for the development and manufacturing of larger composite aircraft products. This thesis has investigated the use of heated tooling as a…
Luminescence and defect properties of novel phosphor β-Zn3 (PO4) 2 : Zr^4+ were systematically investigated. Corresponding to its lowest optical absorption transition at 240 nm, phosphor emits a bluish-green light at 485 nm, which yields the Stokes shift about 20000 cm^-1. The unusual optical properties of Zr^4+ ion a…
Adding yttrium to magnesium can improve the mechanical properties,especially the mechanical behavior at high temperature.The valence electron structures of Mg-Y alloy were analyzed with the empirical electron theory of solids and molecules(EET).Calculation shows that yttrium is on the fifth hybrid level and magnesium…
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Having higher melting temperature than polyethylene, polypropylene has been expected as insulation material for power cable. But isotactic polypropylene used generally is unsuitable as cable insulation because it shows poor flexibility, low breakdown strength due to growing spherulites, and so on. But stereoregular sy…
Univ Antwerp, B-2020 Antwerp, Belgium. Bio Minerals Nv, Destelbergen, Belgium. Limburgs Univ Ctr, BIOMED, Limburg, Belgium.
In order to investigate the effect of Mg, Al doping on the electronic structure of LiCoO2, and to find the mechanism of high electronic conductivity in Mg-doped LiCoO2, we have carried out first-principles calculations based on density-functional theory (DFT) for LiCoO2, Li(Co, Al)O2 and Li(Co, Mg)O2 systems. Studies…
(2004). Nano Bioceramics for Biomedical and Other Applications. Materials Technology: Vol. 19, No. 4, pp. 224-233.
An analytical model is described for characterizing the deformation and failure behavior of the concrete in the process of penetration and perforation. According to the energy balance relationship crossing the wave front, the continuity of movement of the surface of projectile and the energy transfer, the scaling law…
The continuous cooling curves during melt-spinning process of typical Fe3B/Nd2Fe14B-type nancomposite permanent magnet alloys Nd4Fe77.5-xTxB18.5 where T is Cr or Cu were measured using the infrared imaging technique and a continuous cooling transformation (CCT) diagram was constructed. The CCT diagram suggested that t…
On the basis of the vector diffraction theory, the equation o f two_dimensional grating in arbitrary angle of incidence is given, the complet e analytical form of angular dispersion formula of two_dimensional grating is f irst ly deduced, and the concept of angular dispersion of diffractive polar angle (AD DPA)(the fi…
The Confederate submarine H. L. Hunley, built in 1863, was successfully recovered in August 2000 after nearly 140 years of immersion in the Atlantic Ocean. One of the most significant challenges faced in the Hunley's stabilization and conservation will be the effective removal of chloride from the corrosion products p…
The semiconducting properties of anodic passive films formed on polycrystalline copper in aqueous borax solutions, pH 9.2, are studied using electrochemical impedance spectroscopy (EIS) and voltammetry. The semiconducting nature of the cuprous passive layer is analysed in the potential region near de rest potential as…
The article presents a mathematical model and results of calculations of the processes of heat and mass transfer in a metal-hydride module intended for purification of hydrogen from admixtures. The model characteristics attributable to the small dimensions of solid phase particles and to the change in hydrogen concent…
Pretilt angle generation and liquid crystal (LC) aligning capabilities for a nematic (N) LC with obliquely polarized UV exposure on a homeotropic polyimide (PI) surface by an in-situ photoalignment method were studied. The high pretilt angle of 30θ for NLC with obliquely polarized UV exposure on the PI surface for 20…